[4+2]Cycloadditions of organometallic-substituted siloles with dimethyl acetylenedicarboxylate and tetracyanoethylene
作者:Bernd Wrackmeyer、Wolfgang Milius、Moazzam H Bhatti、Saqib Ali
DOI:10.1016/s0022-328x(02)02114-9
日期:2003.1
trimethylstannyl and a diethylboryl group in 2,4-positions (4), four organyl groups, a diethylboryl group in 3-position and a hydrido function at the silicon atom (5) react by [4+2]cycloaddition with dimethyl acetylenedicarboxylate, MeOC(O)CCC(O)OMe (1), and tetracycanoethylene, (NC)2CC(CN)2 (2), to give 7-silanorbornadienes (6–8) and 7-silanorbornenes (10–12), respectively. The silole 5 is converted
1-Sila-2,4-环戊二烯(甲硅烷基),在三个位置(3个)带有五个有机基和一个二乙基硼基,四个位置,在2,4-位置(四个)带有四个有机基,一个三甲基锡烷基和一个二乙基硼基,四个有机基基团,3位的二乙基硼基和硅原子上的氢化官能团(5)通过[4 + 2]环加成反应与乙炔二羧酸二甲酯,MeOC(O)CCC(O)OMe(1)进行反应,和tetracycanoethylene,(NC)2 CC(CN)2(2),得到7- silanorbornadienes(6 - 8)和7- silanorbornenes(10 - 12),分别。筒仓5被转换成异构体8和8 ',和12和12' ,其中,在每一个主要异构体(森那组8和12)占据顺位上相对于所述C(2)C(3)键。通过X射线分析确定10a的分子结构。7-硅氧烷基降冰片二烯(7)通过形成SirationO键和三甲基锡烷基的1,3-迁移而重排